Traveling scaffold



March 31, 1953 H.' c. RAFTERY TRAVELING SCAFFOLD 2 SHEETSSHEET 1 FiledOct. 13, 1947 INVENTOR.

ggzrold C. Rafiery. M

H. C. RAFTERY TRAVELING SCAFFOLD March '31, 1953 2 Sl-IEETSSHEET 2 FiledOct. 13, 1947 INVENTOR.

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Patented Mar. 31, 1953 UNITED STATES PATENT OFFICE 3 Claims.

This invention relates to a mobile painters hoist or scaffold, by meansof which a painter or other workman can move himself both horizontallyand vertically over a buildin wall which is being worked upon.

An object of my invention is to provide a novel mobile painters hoist orscaffold, on which the workman can stand and can control his movementsboth horizontally and vertically from a stand or cage in which he isworking.

Another object of my invention is to provide a novel mobile hoist orscaffold, including an electrically operated table which is positionedon the roof of the building, and which is caused to move over the roofof the building by an electric drive.

Still another object of my invention is to provide a novel mobile hoistor scaffold which can be quickly and easily set up on the roof of thebuilding, and which will move along the roof of this building with easeand facility.

Other objects, advantages and features of invention may appear from theaccompanying drawing, the subjoined detailed description and theappended claims.

In the drawing:

Figure l is a perspective view of the mobile table in position on aroof.

Figure 2 is a top plan view of the same.

Figure 3 is a perspective view of the workmans cage or stand.

Referring more particularly to the drawing, my invention consists of amobile table I, and a cage 2, which is supported by the table I, and iscontrolled as to its horizontal and vertical position by the controlmechanism on the table I, all of which will be further described.

My mobile hoist or scaffold is particularly useful when used onbuildings including a roof 3, and a fire wall 4. The table I, includes atop 5, and a pair of rear legs 6, and a pair of front legs 7. The rearlegs 6, are adjustable as to length by suitable means, such as thematching holes 8.

A pair of brace legs 9-9, are attached to the legs 6 and I, and eachbrace leg has a wheel or roller I0, mounted on its outer end to bearagainst the fire wall, 4. The brace legs 9, are also adjustable inlength by suitable means, such as the matching holes II. A boom I2,projects outwardly from the table top 5, and i fixedly attached at itsinner end to this table.

A pair of Wheels or rollers l3-I3, are mounted at the outer end of theboom I2, and these last named wheels rest on top of the fire wall 4, androll alon this wall as will be further described.

An electric motor 14, is mounted on the top 5, and this motor drives thereduction gear I5, and the drive shaft I6, extending from this gear. Thedrive shaft I 6, is attached to one of the wheels I 3, and when themotor I4, is energized, the drive wheel I3, will be driven, thus movingthe entire table assembly I, across the roof 3, and along the fire wall4. The motor I 4, is controlled by the workman from the scaffold 2, aswill be further described.

An electric motor I1, is also mounted on the top 5, and this motordrives the reduction gear I8, which in turn drives the reel I9. A cable20, extends from the reel I9, and thence over a sheave 21, on the end ofthe boom I2, and is fixedly attached to the transverse lift bar 22, ofthe scaffold 2.

The scaffold 2, is preferably formed of structural members and is builtup as a frame substantially as shown, including the floor 23, upon whichthe workman stands. The lift bar 22, is attached to the scaffold bymeans of slings 24,'so that the lift bar can move inwardly or outwardlyrelative to the wall, as the scaffold 2, might be raised or lowered, Aplurality of rollers 25, are attached to the scaffold 2, and restagainst the wall so that the scaffold can be easily moved. An electriccontrol box 25, is mounted on the scaffold 2, and this control box isconnected to the motors I4, and IT, to actuate these motors as theworkman desires to move either horizontally or vertlcally across theface of the building wall.

The motors I4, and I1, are of the reversible type, all of which is usualand well known, consequently, the drive wheels I3, can be rotated ineither direction, thus moving the table I, horizontally in eitherdirection, Similarly, the reel I9, can be rotated in either direction,thus raising or lowering the scaffold 2, as may be desired.

The arms 9, are used as braces to hold the table I, a proper distancefrom the fire wall 4. Furthermore, the weight of the motors I4, IT, aswell as the gear boxes, the reel I9, etc., is sufiicient when positionedat the end of a lever arm, such as the boom, I2, to adequatelycounter-balance the weight of the workman as well as the weight of thecage 2.

Having described my invention, I claim:

1. A mobile hoist comprising a table,legs depending from the table,rollers mounted on the legs, a table top, a boom projecting from thetable top, a wheel mounted on the boom, an electric motor mounted on thetable top, drive means eX- tending from said motor to said wheel on theboom, a reel mounted on the table top, a sheave on the boom, the cableextending over the sheave and around said reel.

2. A mobile hoist comprising a table, a pair of legs depending from saidtable, means to adjust the length of said legs, a roller mounted on thelower end of each of the legs, a pair of horizontal brace legs mountedon the table and projecting therefrom, means to adjust the length ofsaid horizontal brace legs, a roller journalled on the outer end of eachof said brace legs, a boom mounted on the table and projectingtherefrom, a support wheel mounted adjacent the outer end of said boom,an electric motor mounted on the table, drive means extending from saidmotor to the supporting wheel mounted on the boom.

3. A mobile hoist comprising a table, a pair of legs depending from saidtable, length adjusting means on each of said legs, a roller mounted onthe lower end of each of the legs, a pair of horizontal brace legsfixedly mounted below the table and projecting beyond one edge of thetable, length adjusting means on each of the horizontal brace legs, aroller journalled on the outer end of each of said brace legs, a boomfixedly mounted on the top of the table and projecting horizontallytherefrom, a support wheel mounted adjacent the outer end of said boom,an electric motor mounted on the table, a drive shaft extending fromsaid motor to the supporting wheel on the boom.

HAROLD C. RAFI'ERY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 553,768 Arrouguier Apr. 10, 1866414,218 Holm Nov. 5, 1889 1,421,609 Sturm July 4, 1922 1,423,998 CampJuly 25, 1922 2,164,128 Medenwald June 27, 1939 2,491,621 Roos Dec. 20,1949 FOREIGN PATENTS Number Country Date 11,237 Germany Oct. 1, 1880174,704 Great Britain Jan. 27, 1922

